I think I'm hardly making an original argument, but a big problem is binding Compute and Data, so companies have an incentive to hoard as much data as possible and keep it hostage. Feels like deep down that's the whole valuation of Silicon Valley
Honestly I should look to see if there's places that are working on privacy preserving metrics systems and apply.
But in the end, IMHO what really needs to happen is to enable full data ownership. The semantic web, there was also another project by Tim Berners Lee...
Of course there is an opposition that believes this hinders digital development in Europe, which is quite slow or nonexistent, but that is also often caused by said opposition itself instead of privacy laws. Because the few digital experts need all their energy in fighting their ideas and corruption.
And honestly, I think it's necessary.